I wanted power windows for my 66 dart but I"m cheap!

Very clever. I had a rough thought after changing the electric window mechanism in my 2002 T&C that it might be possible to adapt it to our 60's cars. Most new cars use a similar design (see ebay). Instead of the old arm lever, there is a track at each end with a block that moves on a cable. The cable is in a metal sheath like a speedometer cable. The sheaths cross over to form an X between the tracks, so it is like a circulating loop with the motor in the center. I would bet there are only a few different sizes to match the multitude of car models. If you can figure a way to mount the tracks inside the door, you would be done. One issue is that our door glass is thicker and heavier, but probably not a big deal since new cars have more friction from their tighter weather seals.